Radiation protection dosimetry最新文献

{"title":"Experimental testing and simulation analysis of radiation shielding performance of 90SR-90Y radiation sources using different materials.","authors":"Yi Han, Xiaomiao Chi, Qinjian Cao, Liye Liu, Yuchen Liu, Faguo Chen","doi":"10.1093/rpd/ncaf077","DOIUrl":"10.1093/rpd/ncaf077","url":null,"abstract":"<p><p>The study investigated the maximum range of 90Sr-90Y sources in different shielding materials and assessed β-directional dose equivalent rates and γ ambient dose equivalent rates across varying thicknesses of shielding. Results indicated: (1) Significant differences in 90Sr-90Y source ranges among materials, with the shortest β-ray range observed in tungsten alloy (0.00 to 0.50 mm) and high-purity lead (0.5 to 1.0 mm). (2) Generally, there was good agreement between experimental and simulation data, except at a thickness of 0.5 mm for high-purity lead, where a deviation of 51.4 per cent in β-directional dose rates was observed, likely due to errors in the lead cross-section data. (3) Comparative analysis demonstrated that combinations such as \"304 + W\" or \"304 + Pb\" offer enhanced shielding effectiveness against 90Sr-90Y sources. This study provides valuable insights for selecting β-radiation shielding materials and structures.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"775-785"},"PeriodicalIF":0.7,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144637811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cost-effective shielding design based on the dose length product method for shielding calculations in X-ray computed tomography systems.","authors":"Kimiya Noto, Wataru Mitsui, Tadanori Takata, Hironori Kojima, Kosuke Matsubara, Ichiro Yamaguchi","doi":"10.1093/rpd/ncaf078","DOIUrl":"10.1093/rpd/ncaf078","url":null,"abstract":"<p><p>In medical facilities, pre-shielding calculations are essential when introducing new X-ray equipment to protect the staff from radiation. For computed tomography (CT), the dose length product (DLP) method is commonly used for shielding calculations. This method allows the evaluation of the dose at any wall position. This study proposed a cost-effective design for CT room shielding, adjusting the material thickness based on the operator's exposure and the room's environment. Scattered radiation was measured using an optically stimulated luminescence dosemeter. The calculated values were 2.0 to 7.5 times higher than the measured values inside the CT room, confirming the accuracy of the DLP method in estimating the actual dose. No scattered radiation was detected outside the CT room. This study demonstrates that the DLP method enables pre-installation shielding calculations that balance cost and safety.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"795-801"},"PeriodicalIF":0.7,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144619934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and performance evaluation of portable thyroid monitor for in vivo monitoring of 131I.","authors":"Rajesh Sankhla, P Prathibha, Pramilla D Sawant, M S Kulkarni, Probal Chaudhury","doi":"10.1093/rpd/ncaf084","DOIUrl":"10.1093/rpd/ncaf084","url":null,"abstract":"<p><p>A compact, portable, and tabletop thyroid monitor has been developed for in vivo measurement of 131I activity in the thyroid. This system is designed for use in laboratory settings for monitoring of occupational workers and is also suitable for onsite deployment by radiological emergency response teams during radiation emergency situations for thyroidal measurement of the general public. The monitor incorporates a 51 mm diameter × 51 mm-thick NaI(Tl) scintillation detector coupled with a standalone 1 K multi-channel analyzer, housed within a shielded collimator. The system allows for variable counting geometries, accommodating diverse measurement requirements. Key design elements include a vertical movement system, a chin rest, a calibrated neck-to-collimator distance scale, and an Light Emitting Diode-based alignment indicator to ensure precise positioning of the thyroid relative to the detector. A specialized software has been developed for the quantification of thyroidal 131I activity, intake estimation, and committed effective dose calculation. Under normal radiation background conditions (~70 nSv/h), the system achieves a minimum detectable activity of 60 Bq with a 5-min counting time. The monitor is capable of accurately assessing thyroid equivalent doses below 50 mSv, even under conditions of elevated environmental radiation following radiation emergency situations. This system enhances rapid and in situ thyroidal 131I monitoring, supporting radiation protection efforts in both routine monitoring and emergency response scenarios.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"762-774"},"PeriodicalIF":0.7,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144643257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of knowledge and concerns about radiation between the general population and radiological technologists using a fact-finding survey.","authors":"Kako Ohshima, Kaita Nakao, Rika Morooka, Satoshi Takeda, Yoshiya Fukamizu, Nanako Ueshima, Syo Murata, Junichi Kaneko, Tomohiro Arai","doi":"10.1093/rpd/ncaf082","DOIUrl":"10.1093/rpd/ncaf082","url":null,"abstract":"<p><p>We conducted an online survey of 1953 members of the general population (valid response rate: 65.1%) and 384 radiological technologists (valid response rate: 100%) to examine the relationship between radiation knowledge and concerns. The mean knowledge score (maximum: 50) was 28.7 in the general population and 40.2 among radiological technologists. The mean concern scores (maximum: 50) were 25.0 and 17.1, respectively. Both scores differed significantly between the groups (Mann-Whitney U test, P < .01). In the general population, the relationship between knowledge and concern scores varied according to age. In those aged < 30 years, the correlation was weak (R, -0.411 to -0.412), whereas in those aged ≥ 30 years, it was stronger (R, -0.541 to -0.546), suggesting that knowledge reduces concerns. No significant age-based differences were observed among the technologists. These findings suggest that increasing knowledge about radiation may help alleviate concerns.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"753-761"},"PeriodicalIF":0.7,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144643256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Faecal excretion of thorium by NORM workers.","authors":"Gregory S Hewson, Martin Ralph, Marcus Cattani","doi":"10.1093/rpd/ncaf081","DOIUrl":"10.1093/rpd/ncaf081","url":null,"abstract":"<p><p>Exposure to thorium-bearing dust in industries handling and processing monazite and other minerals can pose radiological risks to workers. This study aimed to reassess historical faecal bioassay data collected over 10 d from two monazite plant workers using updated biokinetic and dosimetric models. Another objective was to evaluate the feasibility of faecal thorium bioassay for contemporary operations involving naturally occurring radioactive materials (NORM). The retrospective analysis found that the bioassay-derived thorium intakes were significantly higher than those estimated via personal air sampling. The effective dose estimates for the two workers were similar and ranged from 0.95 to 2.40 mSv over the 5-d exposure period, depending on the worker's assumed mode of breathing. The study confirmed that faecal thorium bioassay remains a viable tool for monitoring workers exposed to insoluble thorium dust, but the timing of sample collection, individual physiology, and background dietary intake of NORM must be considered.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"786-794"},"PeriodicalIF":0.7,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12311421/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144643258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of sampling and analytical uncertainties and estimation of natural radioactivity levels in the soil samples in Kalpakkam, Tamilnadu.","authors":"Bommadeni Arun, Viswanathan S, Menaka M, Kothai Parthasarathy, Balasubramaniam Venkatraman","doi":"10.1093/rpd/ncaf089","DOIUrl":"https://doi.org/10.1093/rpd/ncaf089","url":null,"abstract":"<p><p>The high-purity germanium (HPGe) detector is used to quantify natural radioactivity concentrations in soil samples. The total uncertainty due to the contribution of the analytical method and sampling uncertainty is evaluated in this study. The relative sampling uncertainty values for 40K, 238U, and 232Th are found to be within 5%. The measured specific activity levels ranged between 225.6 ± 8.5 Bq/kg and 479.6 ± 13.0 Bq/kg for 40K, 12.1.6 ± 1.4 Bq/kg and 73.2 ± 2.7 Bq/kg for 238U, and 48.7 ± 2.6 Bq/kg and 548.7 ± 17.0 Bq/kg for 232Th, respectively. The radiological hazard parameters, such as absorbed dose rates and annual effective dose values, were estimated from the 40K, 238U, and 232Th activity concentration values. The absorbed dose rate values ranged between 45 nGy/h and 383 nGy/h with a mean value of 142 nGy/h. The annual effective dose values ranged from 0.06 mSv/y to 0.47 mSv/y with a mean value of 0.17 mSv/y.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144718348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning-based estimation of occupational radiation dose in interventional cardiology.","authors":"Kevser A Hışıroğlu, Ozan Toker, Melis T Özşahin, Orhan İçelli","doi":"10.1093/rpd/ncaf064","DOIUrl":"10.1093/rpd/ncaf064","url":null,"abstract":"<p><p>In interventional cardiology, occupational radiation exposure for medical personnel can reach high levels, underscoring the critical need for effective radiation protection and monitoring methods. This study employs machine learning algorithms to estimate radiation doses received by personnel within a virtual 3D angiography room designed to reflect realistic clinical settings. Monte Carlo simulations generated radiation data across various scenarios, accounting for personnel positions, radiation source distance, and exposure angles typical in angiography. The simulation data were used to train five machine-learning algorithms (Gradient Boosting, K-nearest neighbors, Random Forest, Linear Regression, and Decision Tree). Key findings showed that machine learning models, particularly Gradient Boosting, could effectively predict dose levels by utilizing spatial and operational parameters without requiring physical dosemeter. This study provides a framework that could streamline radiation monitoring practices, making dose assessments more accessible and efficient for routine use in clinical environments.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"690-700"},"PeriodicalIF":0.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144512420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing patient and staff radiation exposure in interventional cardiology: how to achieve it.","authors":"Federica Zanca, Celine Collard, Michel Henry, Emmanuel Rombaut, Sonia Sghaier, Justine Massart, Pierre-Emmanuel Massart","doi":"10.1093/rpd/ncaf069","DOIUrl":"10.1093/rpd/ncaf069","url":null,"abstract":"<p><p>Radiation exposure is a primary concern during interventional cardiology procedures. This study evaluates the impact on patient and operator radiation exposure of implementing modern shielding, innovative imaging technologies and optimized protocols, combined with staff education. Radiation exposure data during coronary angiography (CA) and percutaneous coronary intervention (PCI) procedures were analyzed in three cohorts: use of historical imaging protocols and conventional operator shielding (P0); introduction of a suspended operator radiation protection system (P1); implementation of innovative imaging chain and optimized protocols (P2). Patient radiation levels between P0 and P2 were significantly reduced by up to 44% for CA procedures and up to 74% for PCI procedures. Operator doses showed a reduction of 86% and 93% for CA and PCI, respectively. Compared to literature, our patient dose levels were among the lowest, with values well below current European dose reference levels.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"709-719"},"PeriodicalIF":0.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144592050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Small-field measurements in 3D polymer gel dosimetry using optical computed tomography.","authors":"Hiraku Kawamura, Yoshitomo Araki, Yuichi Sato, Masumi Uehara","doi":"10.1093/rpd/ncaf066","DOIUrl":"10.1093/rpd/ncaf066","url":null,"abstract":"<p><p>Polymer gel dosimetry enables three-dimensional measurements. We measured the dose-response characteristics using an optical computed tomography (CT) system and evaluated the scatter correction for polymer gel-optical CT to calculate accurate field output factors. The dose-response can be expressed using an appropriate fitting model in the range of 0-10 Gy. The irradiated four-finger gel phantom with four collimators of different diameters was scanned using optical CT. The corrected optical CT image showed an improved low-intensity signal near the edge closer to the film, resulting in the profile. The field output factors in the 5 mm diameter small irradiation field were calculated using a gel dosemeter-optical CT system and compared with those from several ionization chambers. The polymer gel-optical CT system is suitable for calculating field output factors in small-field measurements.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":"742-751"},"PeriodicalIF":0.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144529414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of a prediction model for ambient dose equivalent rate distribution based on ecological half-life profiles using LASSO regression and KURAMA data.","authors":"Yoshiaki Shikaze, Kimiaki Saito, Naoki Tanimura, Kazuya Yoshimura, Liu Xudong, Masahiko Machida","doi":"10.1093/rpd/ncaf086","DOIUrl":"https://doi.org/10.1093/rpd/ncaf086","url":null,"abstract":"<p><p>The two-component model, comprising a fast-decay and a slow-decay component, has been widely used to approximate the decreasing trends of air dose rates in contaminated areas surrounding major nuclear accident sites. However, its adequacy is yet to be thoroughly validated. This study analyzed extensive car-borne survey data collected from 2011 to 2016 after the Fukushima Daiichi Nuclear Power Plant accident using the least absolute shrinkage and selection operator regression with a high-degree-of-freedom model. This analysis aimed to evaluate the adequacy of the two-component model and investigate the profiles of ecological half-lives. The results demonstrate that the two-component model can approximate the decreasing trend of air dose rates in the Fukushima area well in most cases. However, in ~20% of the cases, the one-component model provided a better fit. The fast-decay component in the two-component model exhibited a sharp ecological half-life peak below 1 y, with a frequency distribution peaking at 0.3-0.4 y. In contrast, the slow-decay component displayed a broader half-life peak in approximately half of the cases, with a frequency distribution spanning several years to over 50 y. The reduction speed of air dose rates was fastest in urban areas, followed by paddy fields, croplands, deciduous forests, and evergreen forests. The reduction speed decreased as the initial air dose rate increased, a trend explained by the weight assigned to the fast-decay component rather than the value of its ecological half-life. Future predictions of air dose rate distributions were made using a prediction model formula that incorporated the average ecological half-life profiles calculated for each land-use and initial air dose rate category. Prediction accuracy was verified through comparison with integrated map data, which merge air dose rate datasets obtained using different monitoring methods and represent the most currently reliable source. The predicted values tended to decay faster overall than the integrated map data, with an average deviation within 10% over the six-year period. This discrepancy arises because the car-borne survey data were collected on paved roads, where air dose rates decrease rapidly due to the quick washout of radiocesium. The differences between the prediction model values and integrated map values were larger for forests than for farmlands (paddy fields and croplands) and urban areas. This suggests that the reduction in air dose rates is slower in pure forests, where the car-borne surveys were rarely conducted.</p>","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144699284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}